structures which increase in diameter during the whole 
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42) Structiral and. Physiological Botany, "2 ee 
growth of plants depends mainly on the constant fresh forma- 2 E 
' tion of this tissue. | a 
The increase of thickness in plants, on the contrary, — : 
5 
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Fic. 65 —‘Tela contexta’ from the medullary layer of the pileus of a 
Fungus, Amanita muscaria; h ordinary cells ; wz laticiferous cells. 
(x 360.) . 
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occurs especially in those parts where there are permanent 
